How to add items to menu

Please note: this is a guide for WordPress beginners and doesn’t relate to a theme in particular.

Please note that, regardless of the theme you use, when you first activate the theme you will see a fallback menu (generally composed of all your pages) or a link that asks you to create a menu.

In most cases you will want to use your own custom menu to which you’ll add pages, categories, projects, services etc. Follow this 
official guide to learn how to work with menus in WordPress.